Assuming you may mean Shiny or customized Pokemon, Pokemon cannot be changed to shiny willingly without using the Action Replay. Shiny Pokemon can be encountered randomly in the wild with a low rate of 1/8192, which will alter the color of the normal Pokemon. Customized Pokemon (Shadow Lugia, etc.) may also just be a hack or mod within Pokemon Diamond, Pearl, and Platinum.
You can change your Petpet's colour by entering Fashion Field. You can find Fashion Field by looking on your map. Once you have entered, find a shop called Groomtopia. In there, you can change your petpet's colour only if you have a colour bottle already. You can get colour bottles with NC (Nickcash) or if you're a member.
You Can't
You can use your Neopets account for PetPet park.
TNT, or The Neopets Team, made Petpet Park.
You can get a Petpet Park account and play free. There's a lot of things that don't require real money, you can play mini games, do quests and dress up your petpet. Right now there are haircuts, new colors, more types of petpet and a few lands you can pay for, but that's it.
in the petpet station
It is on the map!
The Petpet Plaza is found by easily looking in your map on Petpet park.
Petpet Park was created in 2008-10.
You can use your Neopets account for PetPet park.
At the Petpet Emporium.
You don't.
you guessed it, it's in PetPet Park :) hammered you
TNT, or The Neopets Team, made Petpet Park.
Market Lane
You do have homes but I dont know how to get one, but I do have an account at Petpet Park.
To get parkpoints on Petpet Park, do a job for someone or play games.
you don't get it on petpet park. you have to actually buy it with real money.
You can get the golden egg on petpet park at the pet shop